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904合金的液下泵的配套管系采用铸造工艺加工,其化学成分(％)为:C≤0.6、Si≤1.5、Mn≤1.5、Cr18.0～22.0、Ni23.0～27.0,Mo4.0～5.5,Cul.5～3.0;铸管规格为φ120mm×1100mm×10mm及φ120mm×900mm×10mm两种。铸制后产生了弯曲变形,其中最大上挠度达13mm,超过铸件验收标准。为了不使这批铸管报废,采用了氧-乙炔火焰矫直。这种矫直方法的关键是掌握火焰局部加热引起变形的规律,矫直效果主要取决于工件的加热部位、
904 alloy pump supporting the use of liquid casting process, the chemical composition (%): C ≤ 0.6, Si ≤ 1.5, Mn ≤ 1.5, Cr 18.0 ~ 22.0, Ni 23.0 ~ 27.0, Mo4.0 ~ 5.5, Cul.5 ~ 3.0; cast pipe specifications for φ120mm × 1100mm × 10mm and φ120mm × 900mm × 10mm two. After casting produced bending deformation, the maximum deflection of up to 13mm, exceeding the acceptance criteria castings. In order not to discard these castings, oxygen-acetylene flame straightening was used. The key to this straightening method is to grasp the law of local deformation caused by the heating of the flame. The straightening effect mainly depends on the heated parts of the workpiece,